Vehicle

Abstract

A vehicle includes a high-voltage system circuit including a high-voltage battery, a low-voltage system circuit including an updater and a low-voltage battery having a lower output voltage than the high-voltage battery, a DC-DC converter coupled between the two circuits, a controller that controls the two circuits and the DC-DC converter, and a wireless communication device. The updater updates a program of an update-target device. The wireless communication device wirelessly receives update data for the program. The controller calculates time taken for updating the program, based on information on the update data. The controller causes the DC-DC converter to reduce in voltage output electric power of the high-voltage battery and then supply the electric power to the low-voltage system circuit, and thus charges the low-voltage battery in accordance with the calculated time. The updater updates the program using output electric power of the charged low-voltage battery.

The invention claimed is: 
     
       1. A vehicle comprising:
 a high-voltage system circuit comprising
 a high-voltage battery; 
 
 a low-voltage system circuit comprising
 a low-voltage battery having a lower output voltage than the high-voltage battery, and 
 an updater configured to update a program of an update-target device by using electric power supplied from the low-voltage battery; 
 
 a direct current (DC)-DC converter coupled between the high-voltage system circuit and the low-voltage system circuit and capable of reducing in voltage output electric power of the high-voltage battery and supplying the electric power reduced in voltage to the low-voltage system circuit; 
 a controller configured to control the high-voltage system circuit, the low-voltage system circuit, and the DC-DC converter; and 
 a wireless communication device configured to wirelessly communicate with an external device and receive update data for updating the program of the update-target device, 
 wherein the controller is configured to
 calculate, based on information on the update data, time taken for updating the program of the update-target device, and 
 cause the DC-DC converter to reduce in voltage the output electric power of the high-voltage battery and to supply the electric power reduced in voltage to the low-voltage system circuit, and thus charge the low-voltage battery in accordance with the calculated time taken for updating the program of the update-target device, and 
 
 wherein the updater is configured to update the program of the update-target device by using output electric power of the low-voltage battery after the low-voltage battery is charged. 
 
     
     
       2. The vehicle according to  claim 1 , wherein the controller is configured to calculate the time taken for updating the program of the update-target device, based on at least one of a program capacity of the update data, a communication speed between the updater and the update-target device, or a write speed of writing update program to the update-target device. 
     
     
       3. The vehicle according to  claim 1 , wherein the controller is configured to, in a case where there are a plurality of the update-target devices, calculate time taken for updating the programs of the plurality of update-target devices. 
     
     
       4. The vehicle according to  claim 2 , wherein the controller is configured to, in a case where there are a plurality of the update-target devices, calculate time taken for updating the programs of the plurality of update-target devices. 
     
     
       5. The vehicle according to  claim 1 , further comprising:
 an engine serving as a driving source for traveling; and 
 a motor coupled to the high-voltage battery and serving as a driving source for traveling. 
 
     
     
       6. The vehicle according to  claim 2 , further comprising:
 an engine serving as a driving source for traveling; and 
 a motor coupled to the high-voltage battery and serving as a driving source for traveling. 
 
     
     
       7. The vehicle according to  claim 3 , further comprising:
 an engine serving as a driving source for traveling; and 
 a motor coupled to the high-voltage battery and serving as a driving source for traveling. 
 
     
     
       8. The vehicle according to  claim 4 , further comprising:
 an engine serving as a driving source for traveling; and 
 a motor coupled to the high-voltage battery and serving as a driving source for traveling.